summaryrefslogtreecommitdiff
path: root/app/models/concerns/routable.rb
blob: 5c1cce98ad4826ace20834d00a6d1d4ffb41da49 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
# Store object full path in separate table for easy lookup and uniq validation
# Object must have name and path db fields and respond to parent and parent_changed? methods.
module Routable
  extend ActiveSupport::Concern

  included do
    has_one :route, as: :source, autosave: true, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
    has_many :redirect_routes, as: :source, autosave: true, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent

    validates_associated :route
    validates :route, presence: true

    scope :with_route, -> { includes(:route) }

    before_validation do
      if full_path_changed? || full_name_changed?
        prepare_route
      end
    end
  end

  class_methods do
    # Finds a single object by full path match in routes table.
    #
    # Usage:
    #
    #     Klass.find_by_full_path('gitlab-org/gitlab-ce')
    #
    # Returns a single object, or nil.
    def find_by_full_path(path, follow_redirects: false)
      # On MySQL we want to ensure the ORDER BY uses a case-sensitive match so
      # any literal matches come first, for this we have to use "BINARY".
      # Without this there's still no guarantee in what order MySQL will return
      # rows.
      #
      # Why do we do this?
      #
      # Even though we have Rails validation on Route for unique paths
      # (case-insensitive), there are old projects in our DB (and possibly
      # clients' DBs) that have the same path with different cases.
      # See https://gitlab.com/gitlab-org/gitlab-ce/issues/18603. Also note that
      # our unique index is case-sensitive in Postgres.
      binary = Gitlab::Database.mysql? ? 'BINARY' : ''
      order_sql = "(CASE WHEN #{binary} routes.path = #{connection.quote(path)} THEN 0 ELSE 1 END)"
      found = where_full_path_in([path]).reorder(order_sql).take
      return found if found

      if follow_redirects
        if Gitlab::Database.postgresql?
          joins(:redirect_routes).find_by("LOWER(redirect_routes.path) = LOWER(?)", path)
        else
          joins(:redirect_routes).find_by(redirect_routes: { path: path })
        end
      end
    end

    # Builds a relation to find multiple objects by their full paths.
    #
    # Usage:
    #
    #     Klass.where_full_path_in(%w{gitlab-org/gitlab-ce gitlab-org/gitlab-ee})
    #
    # Returns an ActiveRecord::Relation.
    def where_full_path_in(paths)
      wheres = []
      cast_lower = Gitlab::Database.postgresql?

      paths.each do |path|
        path = connection.quote(path)

        where =
          if cast_lower
            "(LOWER(routes.path) = LOWER(#{path}))"
          else
            "(routes.path = #{path})"
          end

        wheres << where
      end

      if wheres.empty?
        none
      else
        joins(:route).where(wheres.join(' OR '))
      end
    end
  end

  def full_name
    if route && route.name.present?
      @full_name ||= route.name # rubocop:disable Gitlab/ModuleWithInstanceVariables
    else
      update_route if persisted?

      build_full_name
    end
  end

  # Every time `project.namespace.becomes(Namespace)` is called for polymorphic_path,
  # a new instance is instantiated, and we end up duplicating the same query to retrieve
  # the route. Caching this per request ensures that even if we have multiple instances,
  # we will not have to duplicate work, avoiding N+1 queries in some cases.
  def full_path
    return uncached_full_path unless RequestStore.active?

    RequestStore[full_path_key] ||= uncached_full_path
  end

  def full_path_components
    full_path.split('/')
  end

  def expires_full_path_cache
    RequestStore.delete(full_path_key) if RequestStore.active?
    @full_path = nil # rubocop:disable Gitlab/ModuleWithInstanceVariables
  end

  def build_full_path
    if parent && path
      parent.full_path + '/' + path
    else
      path
    end
  end

  private

  def uncached_full_path
    if route && route.path.present?
      @full_path ||= route.path # rubocop:disable Gitlab/ModuleWithInstanceVariables
    else
      update_route if persisted?

      build_full_path
    end
  end

  def full_name_changed?
    name_changed? || parent_changed?
  end

  def full_path_changed?
    path_changed? || parent_changed?
  end

  def full_path_key
    @full_path_key ||= "routable/full_path/#{self.class.name}/#{self.id}"
  end

  def build_full_name
    if parent && name
      parent.human_name + ' / ' + name
    else
      name
    end
  end

  def update_route
    return if Gitlab::Database.read_only?

    prepare_route
    route.save
  end

  def prepare_route
    route || build_route(source: self)
    route.path = build_full_path
    route.name = build_full_name
    @full_path = nil # rubocop:disable Gitlab/ModuleWithInstanceVariables
    @full_name = nil # rubocop:disable Gitlab/ModuleWithInstanceVariables
  end
end